ask him to attend counseling for the purpose of strengthening/saving your marriage. Personally I would do everything in my power to fight for the marriage and I would pray for DH's heart to soften and to have a desire to address the situation. However, everyone has free will and you cant force someone to fight for their marriage (ie your dh). If he choses to leave try to work on the healthiest divorce for the kids.

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Tara~Married to my wonderful DH and mama to my DS#1 4 years old and DS#2 2 years old